A link is a word that connects two documents(A and B), which means that there are 2 documents and that you know where they are. So on page A you type a word addressed to B, the browser will know what to do when the link is clicked. This is the link syntax:
The "a" indicates to the browser that what is next (after the <>tag symbols) is going to be a link-word.
"href" states the path of the document the browser is going to display when the link-word is clicked. On this case we dont use "/" because we asume they are on the same folder.
the "/a" tag says that the link-word is done.
Useful documents for further reading:
http://www.scriptingok.com/tutorial/HTML-links and
http://scriptingok.com/forum/viewtopic.php?f=5&t=21